论文标题
旋转转移扭矩驱动的运动，变形和高电流处磁空的不稳定性
Spin-transfer torque-driven motion, deformation, and instabilities of magnetic skyrmions at high currents
论文作者
论文摘要
在手性磁铁中，可以通过自旋极化电流移动局部拓扑磁旋转，磁性天空。在增加了当前的强度后，考虑到旋转型应用的高速天空运动的前景，孤立的天空偏离了典型的圆形形状。我们分析了自旋转移扭矩对单个天空形状的影响，包括它的稳定性对绝热增加了施加的电流的强度。对于远高于域壁形成关键各向异性的单轴各向异性的紧凑型天际，我们发现高电流密度为Skyrmion假定具有尾巴的非圆形形状，让人想起射击星。对于较大的较大的天空缘，较差的天空偏远接近临界各向异性，然后我们观察到了临界电流密度，高于该密度，天空变得不稳定。我们表明，对于这些天空，也可以回收射击星的第二个临界电流密度。
In chiral magnets, localized topological magnetic whirls, magnetic skyrmions, can be moved by spin polarized electric currents. Upon increasing the current strength, with prospects for high-speed skyrmion motion for spintronics applications in mind, isolated skyrmions deform away from their typical circular shape. We analyze the influence of spin-transfer torques on the shape of a single skyrmion, including its stability upon adiabatically increasing the strength of the applied electric current. For rather compact skyrmions at uniaxial anisotropies well above the critical anisotropy for domain wall formation, we find for high current densities that the skyrmion assumes a non-circular shape with a tail, reminiscent of a shooting star. For larger and hence softer skyrmions close to the critical anisotropy, in turn, we observe a critical current density above which skyrmions become unstable. We show that above a second critical current density the shooting star solution can be recovered also for these skyrmions.
